In a related question I'm trying to find some conclusive reference(s) helping explain if some halo orbits around the sun-earth or earth-moon $L_1$ or $L_2$ locations can actually be somewhat stable (say, for half-a-dozen orbits). There I mentioned the quote by Dennis Wingo describing ISEE-3's original Halo orbit. He describes Sun-Earth $L_1$ as "a point about 1.5 million kilometers from earth where a spacecraft can safely orbit without using any fuel."
The site http://spacecraftforall.com/a-new-orbit is an interactive thing - if you leave it alone it will usually start the video in about 10 or 15 seconds.
Here I would just like to know specifically - did ISEE-3 spend a few years in a halo orbit around sun-earth $L_1$ without using any fuel, or at least without the regular station keeping thrust maneuvers needed in unstable orbits? (e.g. like DSCOVR needs to do)